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Problems Joining Collaborate Sessions on Mac OS X 10.8.4

We have discovered an issue with the Collaborate web conferencing system and OS X Mountain Lion v10.8.4. If you have recently updated a Mac that you use to join a Collaborate session as a moderator or participant; or if you are trying to view a recorded Collaborate session, please follow either one of the three suggested workarounds below that have been provided by Blackboard.

Affected PlatformsMac OS X 10.8.4

Issue
Recent security changes released by Apple may prevent Web Conferencing customers from launching Blackboard Collaborate sessions and recordings. Customers using OS X Mountain Lion v10.8.4 will be affected. The security changes no longer allow users to auto-launch JNLP files. The following message will appear when trying to launch a session:

Note: Clicking the OK button will NOT launch the session

Solution/Workaround
This issue can be resolved by using one of the following workaround methods: